A YEAR IN SCIENCE 



A TEXT-BOOK FOR FIRST YEAR IN 

 HIGH SCHOOLS 



ADA L. WECKEL, M.S. 



. HEAD OF BIOLOGY DEPARTMENT, OAK PARK AND RIVER 



FOREST TOWNSHIP HIGH SCHOOL, OAK 



PARK, ILLINOIS 



AND 



JOSEPH L. THALMAN, A.M. 



FORMER HEAD OF BIOLOGY DEPARTMENT, OAK PARK AND RIVER 



FOREST TOWNSHIP HIGH SCHOOL ; PRINCIPAL OF 



HIGH SCHOOL, NEW CASTLE, PA. 



CHICAGO NEW YORK 



ROW, PETERSON AND COMPANY 



